| Mod | Save | ||
|---|---|---|---|
| STR | 18 | +4 | +4 |
| DEX | 12 | +1 | +1 |
| CON | 20 | +5 | +7 |
| Mod | Save | ||
|---|---|---|---|
| INT | 5 | −3 | −3 |
| WIS | 14 | +2 | +4 |
| CHA | 6 | −2 | −2 |
Corrosion Sense: The rust monster can pinpoint the location of ferrous metal within 30 feet of itself.
Chaotic Brine Aura: 20ft Aura; 2d4 acid damage per turn; DC 16 CON save or 1 corrosion level; magical metal resists first level.
Chaos-Warped Carapace: On melee hit against it, attacker takes 1d8 acid damage if a 6 is rolled on d6.
Multiattack. Two attacks: Corroding Tendril + Chaotic Mandibles
Corroding Tendril. +7 to hit; reach 10 ft; 11 (2d6+4) dmg; DC 16 Con save or 1 Corrosion Level
Chaotic Mandibles. +7 to hit; reach 5 ft; 15 (2d10+4) dmg
Brine Jet. Recharge 5-6; 30 ft line; DC 15 Dex save; 18 (4d8) acid dmg
Reflexive Antennae. Trigger: An attack roll hits the rust monster. Response: The rust monster uses Antennae.
Lair and Lair Actions
Shifting Sands: DC 14 Dex save or movement halved
Sand Slide: DC 14 Str save or slide 10 ft
Brine Pocket Burst: 3 (1d6) acid dmg, no save